M22 threaded standard, length 450mm, cobalt-containing drill bit,good quality, wear-resistant and durable.
Drand:BOSUN
Choose from the following diameters;

ф=(25/27/30/32/36/38)*450mm
ф=(40/44/46/51/56/63)*450mm
ф=(71/76/83/96/102/112)*450mm
ф=(120/127/132/152/168)*450mm
ф=(200/220/245/254/300)*450mm
ф=(200/220/245/254/300)*350mm